Journal
FOOD SCIENCE & NUTRITION
Volume 9, Issue 3, Pages 1551-1563Publisher
WILEY
DOI: 10.1002/fsn3.2130
Keywords
antioxidant activity; brown seaweed; Cystoseira schiffneri; fucoidans; seasonal variation; structural characterization
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Funding
- Ministry of Higher Education and Scientific Research, Tunisia
- Utique-PHC program (project SEAPOLYMERHYDROGEL) of the CMCU - Ministry of Higher Education and Scientific Research, Tunisia [19G0815]
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The study extracted fucoidan rich in sulfated polysaccharides from the brown seaweed Cystoseira schiffneri and found that its sulfate content and molecular mass varied with the harvest season. Gas chromatography-mass spectroscopy revealed that the fucoidan fractions mainly consisted of mannose, fucose, and galactose.
A fucoidan, sulfated polysaccharide, was extracted from the brown seaweed Cystoseira schiffneri during 4 harvest periods (December, April, July, and September) and studied for its structural and chemical properties. The Cystoseira schiffneri fucoidan (CSF) showed important variation in sulfate content ranging from 7.8% in December to 34.8% in July. This was confirmed by Fourier transform infrared and nuclear magnetic resonance spectroscopies showing characteristic signals of sulfated polysaccharides. Molecular mass of the CSF varied as a function of season from 3,745 in December to 26,390 Da in July. Gas chromatography-mass spectroscopy showed that CSF fractions were mannogalactofucans composed mainly of mannose, fucose, and galactose with low levels of other monosaccharides. Moreover, interesting in vitro antioxidant activities that depend on the harvest season were noted for CSF. Thus, the present work might contribute to establish criteria for extracting bioactive fucoidans from an endemic Tunisian seaweed C. schiffneri.
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